Trying to understand how iPhoto keeps track of pictures...

I am trying to understand how iPhoto stores & organizes pictures.
I moved JPEGs from a portable drive to my hard drive, set iPhoto's preferences to not copy pictures when importing them, then imported them. Unfortunately, all pictures from a certain import has duplicated in iPhoto.... so I "moved to trash" all pictures from that import and tried importing again since the JPEGs were still where I moved them to. When importing, it said they were duplicated .
I am confused. If I "move to trash", I assumed it got rid of whatever index (and preview cache) to that particular JPEG. I was actually surprised it did not delete the actual JPEG but I'm ok with that.
Can someone help explain this behavior?
Thanks
-Ed

iPhoto is a relational database program
In the strongly recommended managed library (you have chosen to ignore this recommendation and use a referenced library) imported photos are copied to the iPhoto library and stored in the originals folder, a thumbnail jPEG is created and places in the data folder and when any modification is made (including autorotation) a modified version of the photo is created and placed in the modified folder. iPhoto updates its database entries to reflect everything it does.
It is critical that you do not make any modifications of any sort to the content or structure of the iPhoto library - doing so is likely to corrupt the library and cause you to lose data.
When you use the referenced mode which you are doing (and which is not recommended) you are taking total responsibility for the original photos which included not moving or modifying them while iPhoto is referencing them
Unfortunately, all pictures from a certain import has duplicated in iPhoto.... so I "moved to trash" all pictures from that import
Did you do this with the iPhoto trash? or did you use the finder to modify the contents of the iPhoto library.
If I "move to trash", I assumed it got rid of whatever index (and preview cache) to that particular JPEG. I was actually surprised it did not delete the actual JPEG but I'm ok with that.
again - iPhoto trash or finder trash. If you move a photo to the iPhoto trash and empty it all traces of that photo in the iPhoto library will be removed - nothing will be done to any file outside of the iPhoto library -- ever
LN

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Joepiet wrote:
The second tab is calles 'Info' as well. Down under you have the possibilty to mark Part of a collection (Deel van verzameling). It should do the trick but it doesn't. I once tried, but I haven't found out what it does.
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Joepiet wrote:
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Now, lets hope I can get my iTunes back into "English" English, as my Dutch is not too good, even though I'm just the other side of the North Sea from you!

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